libmng: make this build again.

srcpkgs/libmng/patches/configure.patch

@@ -0,0 +1,13 @@
+--- makefiles/configure.in.orig	2012-05-23 11:52:20.653259562 +0200
++++ makefiles/configure.in	2012-05-23 11:52:25.517142443 +0200
+@@ -15,10 +15,6 @@ AC_SUBST(VERSION)
+ dnl Checks for programs.
+ AC_PROG_CC
+ AC_ISC_POSIX
+-AM_C_PROTOTYPES
+-if test "x$U" != "x"; then
+-  AC_MSG_ERROR(Compiler not ANSI compliant)
+-fi
+ AM_PROG_LIBTOOL
+ AC_PROG_INSTALL
+ 

srcpkgs/libmng/template

@@ -20,10 +20,8 @@ Add_dependency build jpeg-devel
 Add_dependency build zlib-devel
 Add_dependency build lcms-devel
 
-pre_configure()
+pre_configure() {
-{
-	cd $wrksrc
 	ln -s makefiles/configure.in .
 	ln -s makefiles/Makefile.am .
-	autoreconf -f -i
+	autoreconf -fi
 }